The study of ultrasonic pulse velocity on plain and reinforced damaged concrete Ni Nyoman Kencanawati, Akmaluddin, Buan Anshari, Ahmad Gazi Paedullah and Mitsuhiro Shigeishi MATEC Web Conf., 195 (2018) 02026 Published online: 22 August 2018 DOI: 10.1051/matecconf/201819502026